(chess) An unprotected pawn whose capture would be a losing move for the capturing player.

The European hemlock Conium maculatum, an extremely poisonous plant in the carrot family, Apiaceae / (uncountable) A lethally poisonous drink made from the plant.

A high blood level of alcohol, toxic enough to injure or kill a person.

(idiomatic) Something which is initially regarded as advantageous but which is later recognized to be disadvantageous or harmful; an apparently beneficial or benign instrument or scheme for causing death or harm.

plural of lead poisoner

The poisonous mushroom Entoloma sinuatum.

plural of poison ivy

plural of poisoned chalice

The tree Comocladia dodonaea, whose exudate can cause contact dermatitis.

nux vomica (tree) / nux vomica (fruit)